1 <!DOCTYPE html>
2 <html>
3 <head lang="en">
4 <meta charset="UTF-8">
5 <title>数组去重</title>
6
7 </head>
8 <body>
9 </body>
10 <script type="text/javascript">
11
12 var strs = ['a', 'a', 5, 5,7];
13
14 function remove1(str) {
15 var newStr = [], obj = {};
16 for (var i = 0, h = str.length; i < h; i++) {
17 if (!obj[str[i]]) {
18 newStr.push(str[i]);
19 obj[str[i]] = 1;
20 }
21 }
22 return newStr;
23 }
24 var s1 = remove1(strs);
25 console.log('s1:' + s1);
26
27
28 function remove2(str) {
29 return Array.from(new Set(str));
30 }
31
32 var s2 = remove2(strs);
33 console.log('s2:' + s2)
34
35
36 function remove3(str) {
37 var newStr = [];
38 for (var i = 0, j = str.length; i < j; i++) {
39 if (newStr.indexOf(str[i]) === -1) {
40 newStr.push(str[i]);
41 }
42 }
43 return newStr;
44 }
45 var s3=remove3(strs);
46 console.log('s3:'+s3);
47
48 //4
49 function remove4(str) {
50 var newStr = [];
51
52 str.forEach(function(e, i, str) {
53 if (str.indexOf(e) === i) {
54 newStr.push(e);
55 }
56 });
57
58 return newStr;
59 }
60
61 var s4=remove4(strs);
62 console.log('s4:'+s4);
63
64 //5
65 function remove5(str) {
66 var newStr = [],
67 end;
68 str.sort();
69 end = str[0];
70 newStr.push(str[0]);
71
72 for (var i = 1; i < str.length; i++) {
73 if (str[i] != end) {
74 newStr.push(str[i]);
75 end = str[i];
76 }
77 }
78 return newStr;
79 }
80
81 var s5=remove5(strs);
82 console.log('s5:'+s5);
83
84
85
86 </script>
87
88 </html>
效果图：
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>数组去重</title>
</head>
<body>
</body>
<script type="text/javascript">
var strs = ['a', 'a', 5, 5,7];
function remove1(str) {
var newStr = [], obj = {};
for (var i = 0, h = str.length; i < h; i++) {
if (!obj[str[i]]) {
newStr.push(str[i]);
obj[str[i]] = 1;
}
}
return newStr;
}
var s1 = remove1(strs);
console.log('s1:' + s1);
function remove2(str) {
return Array.from(new Set(str));
}
var s2 = remove2(strs);
console.log('s2:' + s2)
function remove3(str) {
var newStr = [];
for (var i = 0, j = str.length; i < j; i++) {
if (newStr.indexOf(str[i]) === -1) {
newStr.push(str[i]);
}
}
return newStr;
}
var s3=remove3(strs);
console.log('s3:'+s3);
//4
function remove4(str) {
var newStr = [];
str.forEach(function(e, i, str) {//固定顺序，e是数组元素，i是数组元素下标
if (str.indexOf(e) === i) {
newStr.push(e);
}
});
return newStr;
}
var s4=remove4(strs);
console.log('s4:'+s4);
//5
function remove5(str) {
var newStr = [],
end;
str.sort();
end = str[0];
newStr.push(str[0]);
for (var i = 1; i < str.length; i++) {
if (str[i] != end) {
newStr.push(str[i]);
end = str[i];
}
}
return newStr;
}
var s5=remove5(strs);
console.log('s5:'+s5);
</script>
</html>